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在跨越 18 个月内跨越 1,000 多个实体的交易数据库中，我想运行一个查询，将每个可能的 30 天期间entity_id按其交易金额的总和和该 30 天内的交易计数进行分组，并且以我可以查询的方式返回数据。经过大量测试，这段代码完成了我想要的大部分内容：

SELECT id, trans_ref_no, amount, trans_date, entity_id,
    SUM(amount) OVER(PARTITION BY entity_id, date_trunc('month',trans_date) ORDER BY entity_id, trans_date ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS trans_total,
    COUNT(id)   OVER(PARTITION BY entity_id, date_trunc('month',trans_date) ORDER BY entity_id, trans_date ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS trans_count
  FROM transactiondb;

我将在更大的查询中使用类似的结构：

SELECT * FROM (
  SELECT id, trans_ref_no, amount, trans_date, entity_id,
      SUM(amount) OVER(PARTITION BY entity_id, date_trunc('month',trans_date) ORDER BY entity_id, trans_date ROWS BETWEEN UNBOUNDED PRECEDING AND …